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TC65 Hardware Interface Description

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TC65_HD_V02.000 Page 98 of 120 08.06.2006

5.7 Electrical Characteristics of the Voiceband Part

5.7.1 Setting Audio Parameters by AT Commands

The audio modes 2 to 6 can be adjusted according to the parameters listed below. Each

audio mode is assigned a separate set of parameters.

Table 30: Audio parameters adjustable by AT command

Parameter Influence to Range Gain range Calculation

inBbcGain MICP/MICN analogue amplifier gain of

baseband controller before ADC

0...7 0...42dB 6dB steps

inCalibrate Digital attenuation of input signal after

ADC

0...32767 -...0dB 20 * log

(inCalibrate/

32768)

outBbcGain EPP/EPN analogue output gain of

baseband controller after DAC

0...3 0...-18dB 6dB steps

outCalibrate[n]

n = 0...4

Digital attenuation of output signal after

speech decoder, before summation of

sidetone and DAC

Present for each volume step[n]

0...32767 -...+6dB 20 * log (2 *

outCalibrate[n]/

32768)

sideTone Digital attenuation of sidetone

Is corrected internally by outBbcGain to

obtain a constant sidetone independent

of output volume

0...32767 -...0dB 20 * log (sideTone/

32768)

Note: The parameters outCalibrate and sideTone accept also values from 32768 to 65535.

These values are internally truncated to 32767.

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 119 120

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